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Stem Cell Research

New Book: The Ethics of Embryonic Stem Cell Research

There is wide agreement that embryonic stem cell research holds unique promise for developing therapies for currently incurable diseases and conditions, and for important biomedical research. However, as it is currently done, the isolation of embryonic stem cells involves a process in which an early embryo is destroyed, which many find highly problematic.

This has resulted in what I refer to in my book as

The Problem. Either one supports embryonic stem cell research and accepts resulting embryo destruction, or one opposes embryonic stem cell research and accepts that the potential benefits of this research will be foregone.Read More »New Book: The Ethics of Embryonic Stem Cell Research

Iterated in vitro reproduction and genetic orphans

In an article soon to be published in the Journal of Medical Ethics, Rob Sparrow imagines a procedure via which multiple generations of human embryos might be created in the laboratory. Egg and sperm cells would first be generated from existing or new human pluripotent stem cell lines. The resulting eggs would be fertilised using the sperm to create zygotes and ultimately embryos. Embryonic stem cells would then be harvested from these embryos and used to create new egg and sperm cells, which would in turn be used to fertilise one another to create further embryos. This process could be iterated, in principle indefinitely.

Let’s call this procedure ‘iterated in vitro reproduction’ (Sparrow calls it ‘in vitro eugenics’). Iterated in vitro reproduction is not yet possible, but, citing recent developments in the science of stem cell-derived gametes, Sparrow argues that it may well become so, though he acknowledges are number of significant hurdles to its development. He also discusses a number of possible applications of the technology and calls for an ethical debate on these. The most controversial application would be in the creation of designer children. Consider the following case, which is a variant on one of the scenarios imagined by Sparrow:

Jack and Jill present to a fertility clinic. Jack provides a sperm sample, and fertility doctors harvest a number of eggs from Jill. These eggs are fertilized with Jack’s sperm to create embryos, from which embryonic stem cells are derived. These stem cells are then induced to develop into eggs or sperm which are used to fertilise one another, and so on. The process is iterated numerous times, and at each stage, the embryos are genetically screened via pre-implantation genetic diagnosis. This screening is used to inform a process of selective crossing, so that, over several generations, the population of embryos evolves towards certain genetic dispositions desired by Jack and Jill (a disposition towards longevity, say). This process is aided by adding small amounts of genetic material from stem cell lines derived from other individuals. Eventually, doctors identify an embryo with almost exactly the desired combination of genes, and this embryo is implanted into Jill’s womb and carried to term. A child, Jarvis, is born.

Cases like this raise numerous ethical issues, some of which are discussed by Sparrow and the seven commentators on his paper. However, they also raise an interesting conceptual question: would the users of such a technology be the genetic parents of the resulting offspring? Would Jack and Jill be the genetic parents of Jarvis?

Read More »Iterated in vitro reproduction and genetic orphans

Do we want “genetically modified children”? Yes, of course!

The agency that regulates fertility treatment and embryo research in the UK, the Human Fertilisation and Embryology Authority (HFEA), has asked for public views on two possible new forms of fertility treatment that promise to prevent the transmission of mitochondrial diseases to children. These diseases can be extremely severe, leading to (among other things) diabetes, deafness, progressive blindness, seizures, dementia, muscular dystrophy, and death.

Read More »Do we want “genetically modified children”? Yes, of course!

Yamanaka Wins Nobel Prize for Ethics

by Julian Savulescu, Uehiro Chair in Practical Ethics & Director, Oxford Uehiro Centre for Practical Ethics

Yamaka and Gurdon have jointly won the Nobel Prize for Physiology or Medicine, for the discovery that mature cells can be reprogrammed to become pluripotent: that is, already specialized cells can be taken, and using iPS technology, transformed into unspecialized stem cells, which can be used for research and treatment. This technology may ultimately allow us to replace embryonic stem cells entirely in research and treatment thus avoiding ethical issues raised by the destruction of embryos for this purpose.

This is not only a giant leap for science, it is a giant leap for mankind. Yamanaka and Gurdon have shown how science can be done ethically. Yamanaka has taken people’s ethical concerns seriously about embryo research and modified the trajectory of research into a path that is acceptable for all. He deserves not only a Nobel Prize for Medicine, but a Nobel Prize for Ethics.

Read More »Yamanaka Wins Nobel Prize for Ethics

Ban on ES Cell Patents Deeply Immoral

Procedures that involve human embryonic stem cells cannot be patented, the European Court of Justice recently declared. Apparently on the basis that patents “would be contrary to ethics and public policy”

“The decision from the European court of justice is a legal clarification for a court case brought by Greenpeace against a German scientist, Oliver Brüstle, who patented a way to turn stem cells into healthy brain cells. The environmental group argued that Brüstle’s work was “contrary to public order” because embryos were destroyed to gather the stem cells used.

“The judgment effectively supports the Greenpeace view and imposes a ban on patenting work that uses embryonic stem cells on the grounds that it represents an immoral “industrial” use of human embryos.” (http://www.guardian.co.uk/science/2011/oct/18/european-patents-embryonic-stem-cells)

This ruling is deeply immoral. In effect, it shuts down embryonic stem cell research by the back door. This ruling is only supported by a narrow, controversial position on the moral status of the human embryo. It imposes a conservative morality on all Europeans to the detriment of their future health.

Read More »Ban on ES Cell Patents Deeply Immoral

Stem Cell Trial for Stroke: Is It Cannabilizing Human Beings?

By Julian Savulescu

Reneuron has today announced the first transfer of stem cells in the UK to treat stroke. This follows quickly from Geron’s recent trial in spinal cord injury.

This is a historic moment which may be viewed in the same way as the first attempts to use antibiotics. Stem cells offer the door to entirely new form of medical treatment called regenerative medicine. When cells (the building blocks) or tissues of the body are damaged, they are generally not replaced. The dead tissue is replaced by scar that holds the rest of the organ together. So when a person has a stroke (or heart attack) a blood vessel to an area of brain is typically blocked and that area of the brain dies, being replaced by a scar that is functionless. Stem cell therapy offers the hope of replacing that dead or damaged tissue and cells with functioning new cells, in this case nerve cells. This trial is the very first stage to see if the transfer can be done safely.

Read More »Stem Cell Trial for Stroke: Is It Cannabilizing Human Beings?

A tiny step forward

Researchers have managed to produce live-born mice (original article) descended from induced pluripotent stem cells (IPS cells), cells taken from adult animals and treated to become stem cells. That individuals could be produced from embryonic stem cells was already known, but this proves that the IPS cells can produce all kinds of cells in an adult body. Good news for people uneasy about the need for embryonic stem cells… or is it?

If one argues that it is wrong to use embryonic stem cells because embryos carry moral rights, then the question is whether the creation of IPS cells produce something that also has moral rights.

Read More »A tiny step forward

Umbilical cord blood donation: opt out or work on Sundays?

Umbilical
cord blood (UCB) contains haematopoietic stem cells, which can be used for the
treatment of several lethal disorders, including leukaemia
and several types of anaemia. Other sources of haematopoietic stem cells are bone marrow and ordinary peripheral
blood. Unlike bone marrow donation, which requires general anaesthesia, UCB
donation does not cause any inconvenience or significant risks for the donor. Peripheral
blood contains very few stem cells. Another major advantage of using UCB stem
cells is that less genetic similarity is required between donor and recipient.
This increases the chance of finding a ‘match’ and thus of the transplantation
being successful.

Read More »Umbilical cord blood donation: opt out or work on Sundays?

The Future of Making Organs for Self-Transplantation

Scientists have been able to create a new windpipe using stem cells. They took a windpipe from a dead patient, removed all the cells, and placed stem cells from a patient onto the remaining scaffolding to create what was in effect a new windpipe, with the patient’s own cells. The patient had an irreparably damaged her windpipe from TB.

The significance of this is that it opens the door to creating whole organs, like kidneys, livers and perhaps even hearts and lungs. This is a radical advance because up until now, stem cells have only really been useful to replace tissue, or bits of the body without a complex organized structure. But this means we could potentially replace any part of the body with a person’s own stem cells. New livers for people with liver failure, new kidneys from those with kidney failure – and because the cells would come from the patient, there would be no rejection. Indeed, this patient has shown no signs of rejection.

Does this raise any ethical issues?

Read More »The Future of Making Organs for Self-Transplantation